# Niobium diselenide superconducting photodetectors

## TL;DR

This paper investigates niobium diselenide (NbSe2) superconducting photodetectors, demonstrating their energy-dependent photoresponse at cryogenic temperatures, suitable for applications like bolometry, spectroscopy, and infrared imaging.

## Contribution

It presents the first detailed study of NbSe2-based superconducting photodetectors with energy-resolved photoresponse capabilities.

## Key findings

- Superconductivity observed in 2-10 layer NbSe2 devices at 350mK-5K.
- Light absorption breaks superconductivity, producing measurable voltage signals.
- Devices show potential for energy-resolving applications such as bolometry and infrared imaging.

## Abstract

We report the photoresponse of niobium diselenide (NbSe$_2$), a transition metal dichalcogenide (TMD) which exhibits superconducting properties down to a single layer. Devices are built by using micro-mechanically cleaved 2 to 10 layers and tested under current bias using nano-optical mapping in the 350mK-5K range, where they are found to be superconducting. The superconducting state can be broken by absorption of light, resulting in a voltage signal when the devices are current biased. The response found to be energy dependent making the devices useful for applications requiring energy resolution, such as bolometry, spectroscopy and infrared imaging.